The bond dissociation energy of B - F in BF_3 is 646 kJ ,mol^ -1 , whereas that of C - F in CF_4 is 515 kJ ,mol^ -1 . The correct reason for higher B - F bond dissociation energy as compared to that of C-F is

MHT CET Chemistry question

The bond dissociation energy of B - F in is , whereas that of C - F in is . The correct reason for higher B - F bond dissociation energy as compared to that of C-F is

(A)smaller size of B-atom as compared to that of C-atom
(B)stronger -bond between B and F in as compared to that between C and F in
(C)significant interaction between B and F in whereas there is no possibility of such interaction between C and F in Correct
(D)lower degree of interaction between B and F in than that between C and F in .

Answer: (C)

Solution

Boron in has an empty 2p orbital that accepts a lone pair from F ( back-bonding), giving partial double-bond character, while

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Question ID VK-060463